21242402671 has 8 divisors (see below), whose sum is σ = 24286183040. Its totient is φ = 18200910168.

The previous prime is 21242402669. The next prime is 21242402677. The reversal of 21242402671 is 17620424212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21242402671 - 2¹ = 21242402669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242402677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552021 + ... + 589246.

It is an arithmetic number, because the mean of its divisors is an integer number (3035772880).

Almost surely, 2^21242402671 is an apocalyptic number.

21242402671 is a deficient number, since it is larger than the sum of its proper divisors (3043780369).

21242402671 is a wasteful number, since it uses less digits than its factorization.

21242402671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143933.

The product of its (nonzero) digits is 10752, while the sum is 31.

Adding to 21242402671 its reverse (17620424212), we get a palindrome (38862826883).

The spelling of 21242402671 in words is "twenty-one billion, two hundred forty-two million, four hundred two thousand, six hundred seventy-one".